Modulation and demodulation system, modulator, demodulator and phase modulation method and phase demodulation method used therefor

Abstract

The present invention provides a modulation and demodulation system capable of minimizing a bit error rate in a six-phase phase modulation method. A senary signal phase-modulated and outputted by a modulator of a first embodiment is received and phase-modulated by a destination demodulator to a binary signal before conversion by the modulator. The modulator assigns (0, 0), (0, 1), (0, 2), (1, 2), (1, 1) and (1, 0) which are senary signals (b_i, t_i) to first to sixth phases respectively. The demodulator performs a conversion process from the senary signals to the binary signals, for instance, by storing transmitted senary signals and sequentially converting every senary signal of length m to binary signal of length b so as to output them. The process of the demodulator assigns the first to sixth phases as the senary signals (b_i, t_i) to (0, 0), (0, 1), (0, 2), (1, 2), (1, 1) and (1, 0) respectively. The modulator of a second embodiment assigns (0, 0), (0, 1), (0, 2), (1, 2), (1, 1) and (1, 0) to the first to sixth phases respectively by having the senary signals expressed as (Bi, Ti) with i=1 as a first symbol, i=2 as a second symbol, the binary signal as Bi and ternary signal as Ti. The demodulator performs a conversion process from the senary signals to the binary signals, for instance, by storing the transmitted senary signals and sequentially converting every 2 pieces of them to 5 pieces of binary signal so as to output them. The process of the demodulator assigns the first to sixth phases as the senary signals (Bi, Ti) to (0, 0), (0, 1), (0, 2), (1, 2), (1, 1) and (1, 0) respectively.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a modulation and demodulation system, a modulator, a demodulator and a phase modulation method and a phase demodulation method used therefor, and in particular, to encoding for minimizing a bit error per a symbol error in a modulation demodulation method for transmitting a binary signal of predetermined length b correspondingly to a senary phase signal of predetermined length m against a predetermined integral value N other than power of 2, and encoding for minimizing the bit error per the symbol error in the modulation and demodulation method for transmitting a binary signal of length “5” correspondingly to a senary phase signal of length “2.”[0003] 2. Description of the Prior Art [0004] Conventionally, 2n phase modulation is used with n as a positive integer in two-phase phase modulation (Binary Phase Shift Keying: BPSK), four-phase phase modulation (Quadrature Phase Shift Keying: ...

AI Technical Summary

Benefits of technology

[0091] Thus, the modulation and demodulation system of the present invention can minimize the bit error rate in the six-phase phase modulation method and also simplify the circuit configuration in the six-phase phase modulation method.

[0092] The modulation and demodulation system of the present invention can have the effect of minimizing the

Problems solved by technology

In the case of applying the gray encoding to the six-phase phase modulation, however, there is a problem that the bit error is not minimized per the symbol erro

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